Reversible gearing



Aug. 19, 1947.

J. N. LAVERY REVERSIBLE GEARING Filed March 16-, 1944 5 Shuts-Sheet 1Aug. 1947. J. N. LAVERY 2,425,815

' REVERSIBLE GEARING F il ed larch 16, 1944 5 Sheets-Sheet 2 InventprcfOZ/l' AZ 1 4 Veg Aug. 19, 1947. J. N. ILAVERY 2,425,315

v REVERSIBLE GEARING Filed uarn 16; 1944 s She ets-Sheet a Aug. 19,1947. J. N. LAVERY 2,425,815

REVERSIIBLE GEARING Filgd-March 1a, 1944 5 Sheets-Sheet 4 2 JZ/ii/Mlawg@Maoib-L Aug.,19, 1947. .1. N..LAVERY REVERSIBLE GEARING Fild March 16,1944 5 Sheets-Sheet 5 Inventor %/z /l I a l/e 6 ink Wyn; HM fj PatentedAug. 19, 1947 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to reversible gears of a generally similar natureto that constituting the subject matter of my United States Patent No.1,257,253, issued February 19, 1918, upon which the present deviceconstitutes an improvement.

The primary object of the invention is to provide, in a reversible gearof the aforementioned character comprising a constantly running driveshaft and a loosely mounted pulley, novel means for connecting saidpulley to said drive shaft for actuation thereby in either direction.

Other objects of the invention are to provide a reversible gear of thecharacter described which will be comparatively simple in construction,strong, durable, highly efficient and reliable in use, compact and whichmay be manufactured at low cost.

All of the foregoing, and still further objects and advantages of theinvention, will become apparent from a study of the followingspecification, taken in connection with the accompanying drawingswherein like characters of reference designate corresponding partsthroughout the several views, and wherein:

Figure 1 is a view in end elevation of a reversible gear constructed inaccordance with the present invention, showing the drive shaft in crosssection.

Figure 2 is a top plan view of the device.

Figure 3 is a View in vertical longitudinal section through the gear.

Figure 4 is a view in transverse section, taken substantially on theline 44 of Figure 2.

Figure 5 is a View in transverse section, taken substantially on theline 5-5 of Figure 3.

Figure 6 is a fragmentary view in section through the front portion ofthe device, showing the operating means for the clutch shoes.

Figure 7 is a view in transverse section, taken substantially on theline 'l'! of Figure 2.

Referring now to the drawings in detail, it will be seen that theembodiment of the present invention which has been illustrated comprisesa stationary tube l which is to be firmly secured in any desired manneron a suitable support. On one end of the tube I is a stationary flange2. Mounted on the flange 2 adjacent its periphery are stub shafts 3.Pinion gears 4 are journaled on the shafts 3.

Loosely mounted on the stationary tube l is a pulley which is designatedgenerally by reference character 5. The pulley 5 includes a plate 6which is journaled on the stationary tube I, said plate carrying, on itsperiphery, a rim 1 which encircles the flange 2 and the pinion gears 4thereon. The

pulley 5 is to have trained thereon an endless power transmission belt.Formed in the rim 1 of the pulley 5 is an integral ring gear 8 which isin mesh with the pinion gears 4.

A drive shaft 9, from any suitable source of supply, extends through thepulley 5 and has one end portion journaled in the tube l. Rotatablymounted on the shaft 9, within the pulley 5, is a drum Ill. The drum I0is spaced concentrically from the rim 1 of the pulley 5. As best seen inFigure 3 of the drawings, the drum It includes a hub H which, in theembodiment shown, has mounted therein a bushing 12 and a bearing l3,said bearing being journaled on the shaft 9. A screw l4 secures themembers [2 and H3 in position in the hub H. A gear wheel I5 on one endportion of the hub l l is engaged with the pinion gears 4. A greaseretainer I6 is provided between the drum l0 and the gears 4, 8 and I5.

Fixed on the shaft 9 adjacent the drum I8 is a disc l1. Mounted on thedisc ll, adjacent the periphery thereof, are pins [8 which project intothe pulley 5. Friction clutch shoes H! are operable radially on the pins[8 between the drum [0 and the rim 1 of the pulley 5. Radial slots 2|]in the shoes I9 accommodate the pins l8.

Shafts 2| are journaled in the disc IT at diametrically opposite points.Fixed on one end portion of the shafts 2| for operation between the endsof the shoes l9 are discs 22. Links 23 connect the shoes l9 to the discs22 for actuation toward or away from each other thereby.

Mounted on the outer side of the disc I! are pairs of brackets 24.Pivotally mounted between each pair of brackets 24 is a bell crank lever25. Angular rods 26 operatively connect the bell crank levers 25, at oneend, to arms 21 on the shafts 2|.

A collar 28 is slidable on the shaft 9. Arms 29 are fixed on one end ofthe collar 28. The arms 29 are pivotally connected to the adjacent endportions of the bell crank levers 25. A ring 30 is rotatably mounted onthe collar 28. An operating lever 3| for the collar 28 is operativelyconnected to the ring 30.

It is'thought that the operation of the device will be readily apparentfrom a consideration of the foregoing. .Briefly, when the shoes 19 areout of contact with the drum In and the rim 1 of the pulley 5, the gearis in what may be considered neutral position. With the gear in neutralposition, the pulley 5 is free of the shaft 9. To drive the pulley 5 inone direction, the collar 28 is shifted away from the disc H on thedrive shaft 9, thus rotating the discs 22 in a direction to expand theshoes 19 into engagement with the rim 1 of the pulley 5. It willaccordingly be seen that a direct drive is had from the shaft throughthe disc I! and the shoes Is to the pulley for turning said pulley inthe same direction as that in which said shaft is rotating. Vfhen it isdesired to reverse the pulley 5 relative to the shaft 9, the collar 28is shifted toward the disc E 1 thereby contracting the shoes l9 andfrictionally engaging said shoes with the drum l0. Thus, the drum is andthe gear wheel iii are connected to the shaft 0 for rotation with saidshaft. The gear wheel actuates the pinion gears 4 which, through thering gear 8, drive the pulley 5 in the opposite direction.

It is believed that the many advantages of a reversible gear constructedin accordance with the present invention will be readily understood, andalthough a preferred embodiment of the device is as illustrated anddescribed, it is to be understood that changes in the details ofconstruction and in the combination and arrangement of parts may beresorted to which will fall within the scope of the invention asclaimed.

What is claimed is:

l. A device of the character described including a drive shaft, a fixedtube surrounding said shaft formed with an annular flange, stub shaftssupported by said flange, gears on said shafts, a pulley having a hubloosely mounted on said tube, a ring gear on the inner surface of saidpulley engageable with said gears a bearing collar journaled on saidshaft, a bushing surrounding said collar, a hub secured to said bushingand collar supporting a clutch drum at one end and a gear at itsopposite end engageable with the gears on the stub shafts, a platesecured to said drive shaft, radially adjustable clutch shoes supportedon said plate, and a slidable operating means for selectively causingthe frictional engagement of said clutch shoes with said drum and withsaid pulley for effecting the rotation of said pulley in eitherdirection.

2. A device of the character described including a drive shaft, a fixedtube surrounding said shaft formed with an annular flange, stub shaftssupported by said flange, gears on said shafts, a pulley having a hubloosely mounted on said tube, a ring gear on the inner surface of saidpulley engageable with said gears, a bearing collar journaled on saidshaft, a bushing surrounding said collar, a hub secured to said bushingand collar supporting a clutch drum at one end and a gear at itsopposite end engageable with the gears on the stub shafts, a platesecured to said drive shaft, radially adjustable clutch shoes supportedon said plate, slidable operating means for selectively causing thefrictional engagement of said clutch shoes with said drum and with saidpulley for effecting the rotation of said pulley in either direction,and a grease retaining plate mounted on said last mentioned hubseparating said drum from said gearing.

J OHN N. LAVERY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,257,253 Lavery Feb. 19, 1918443,259 Pedersen Dec. 23, 1890 1,946,849 Golliner Feb. 13, 19341,038,033 Walther Sept. 10, 1912 808,309 Ricks et al Dec. 26, 19051,394,131 Wollesen Oct. 18, 1921 2,184,135 Batten Dec. 19, 19392,067,685 Schaper Jan. 12, 1937 2,057,559 De Backer Oct. 13, 1936FOREIGN PATENTS Number Country Date 673,778 France Jan. 20, 1930

